union

B2 · Upper Intermediate Countable noun

n. a group of states or countries that have joined together to form one political unit.

n. a political unit consisting of a number of states or provinces that have joined together for a common purpose.

日本語:連邦※

“The European Union allows people to travel easily between member countries.”

“The treaty aimed to create a more perfect union between the neighbouring territories, harmonising their trade laws and border controls.”

B2 · Upper Intermediate Uncountable noun

n. the act of joining two or more things into one, or the state of being joined.

n. the action of joining together or the state of being joined into a single entity.

日本語:結合※

“The union of the two companies created the largest tech firm in the city.”

“The architect sought a perfect union of form and function, ensuring the building was as beautiful as it was practical.”

B2 · Upper Intermediate Countable noun Law Formal

n. the state of being married or joined in a relationship.

n. the state of being joined in marriage or a similar long-term relationship.

“Their union was celebrated by friends and family from both countries.”

“The legal union of the two heirs served to consolidate the family estates and end decades of litigation.”

B1 · Intermediate Countable noun British English

n. an organisation at a university that looks after students' social lives and rights.

n. a student organisation at a university or college providing social facilities and representing student interests.

“We went to the student union to grab a cheap lunch between lectures.”

“The student union voted to boycott the new campus catering contract in protest of rising prices.”

C1 · Advanced Countable noun Mathematics Technical

n. a set that contains all the members of two or more other sets.

n. the set containing all elements that are members of at least one of a given collection of sets.

“The union of set A and set B includes every number found in either group.”

“To solve the probability problem, the students had to calculate the union of two overlapping data sets.”

C2 · Proficiency Countable noun Computing Technical

n. a special way to store data where different types of information share the same memory space.

n. a data structure that allows multiple variables to share the same memory location, though only one can be used at a time.

“The programmer used a union to save memory in the embedded system.”

“Unlike a struct, a union allocates only enough memory for its largest member, which requires careful management of data types.”

B2 · Upper Intermediate

adj. describing something that belongs to or is done by a workers' union.

adj. pertaining to or represented by a labour union.

“He is a union member and never misses a monthly meeting.”

“The company faced criticism for hiring non-union contractors to complete the electrical work on the new factory.”

C2 · Proficiency Mathematics Technical

v. to combine two groups of things into one large group in mathematics.

v. to perform the union operation on two or more mathematical sets.

“If you union these two lists, you get a complete list of all customers.”

“The algorithm was designed to union the results of several database queries into a single, deduplicated output.”